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Old August 17th 07, 02:35 AM posted to rec.radio.amateur.antenna
Bryan Bryan is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 199
Default Cushcraft A4 Owners

R. Scott wrote:
Question

I assembled it per the instructions for the band parts I wanted. I

triple
measured and Up she went.

I'm really Low (as in instead of 14.150 its down around 13.950)

And I just noticed yesterday looking up that the director seemed a bit
longer than the driven.

And I know as per the first line, I assembled it to the tee for per the
instruction sheet.



Suggestions ?


I had a similar issue with an A3S that's used during Field Day. It turned
out that the PVC caps on the ends of the traps weren't pushed-on flush with
the ends of the traps. We found this when double-checking the overall
length of the elements -- they were a few inches long, even though the
intermediate lengths appeared to be correct. Make sure the PVC caps are
pushed *all the way* onto the traps.

You may also experience some aberration in the resonant frequency if you
don't have adequate decoupling of the feedline's shield from the DE
feedpoint. Cushcraft recommends winding several turns of feedline into a
coil as close as possible to the DE feedpoint. You can also use a 1:1 balun
of your favorite flavor.

Vy 73,
Bryan WA7PRC